Guard construction for machine tools



Aug. 11, 1953 A. BECHLER 2,648,239

GUARD CONSTRUCTION FOR MACHINE TOOLS Filed Dec. 17, 1948 2 Sheets-Sheet l 1 4 INVEN roa- ANDRE 55cm 55 1A A 7' TOR/V5).

Aug. 11, 1953 AQBECHLER GUARD CONSTRUCTION FOR MACHINE TOOLS 2 Sheets-Sheet 2 Filed Dec. 17, 1948 INVENTOR- A/voec BECHLCR N /m V B Patented Aug. 11, 1953 GUARD CONSTRUCgION- FOR MACHINE Andr Bechler, Moutier, Switzerland Application December 17, 1948, Serial No. 65,911 In Switzerland December 24, 1947 2 Claims. 1

Automatic machine tools usually operate at such a great speed that the cuttings and the tool lubricating oil are thrown out by centrifugal action and endanger the operator of the machine. Proposals have been made to provide a protecting cover the edges of which overlap the tray of the machine, to conduct the oil drops and cuttings into the tray. With such covers there is a rather large aperture at each end of the cover.

The primary object of the present invention is to provide as an accessory for a machine tool, which is equipped with a protecting hood or cover, a guard shield vertically swingable about an axis perpendicular to a vertical plane including the horizontal rotation axis of the tool.

Another object of the invention is to make the guard shield of transparent material.

A further object of the invention is to removably support the shield on a vertical pivot provided wherever a guard is desired.

Other objects of this invention will appear hereinafter as the description of the invention proceeds, the novel features, combinations and construction being more particularly pointed out in the specification and the claims hereunto appended.

The accompanying drawing represents, by way of example, an embodiment of the accessory according to the invention.

Fig. 1 is a part sectional side elevation of the accessory;

Fig. 2 is an end elevation;

Fig. 3 is a plan view of a detail on a larger scale and with a portion in section, and

Fig. 4 is a partial sectional view along the line IV-IV of Fig. 3.

Numeral I designates a portion of the bed of the machine to which the accessory is fixed. The drilling tool shown comprises a bearing post 2 made integral with a bracket 3 fixed to the bed i by means of screws 4. The bracket 3 has an extension or arm 5 on which a lever 6 is rotatably mounted; lever 6 serves to axially shift a shaft 7 of a drill in the conventional manner.

A pivot 8 screwed by its lower threaded portion to the upper part of the bearing post 2 (see Fig. 4) has a circular groove which is engaged by a set screw 9 screwed through the base of a support Ill. A horizontal pin I2 projects from both sides of a vertical flat portion of support III, a link member II being swingable on each end of pin I2. Members II straddle and are swingably connected by a pin I9 with an arm I3 extending from a flange I4 having the shape of an inverted U and forming a bracket to which a screen I! made of transparent material is fixedi by means of an anchor plate I5 and screws 16.. The parts l4, I5 and I1 are inclined relatively to: the arm I3. The shield H, the periphery of which: is conformed to that of a protecting cover or hood I8 represented in dot-and-dash lines in; Figs. 1 and 2, has a substantially semi-circular frusto-conical configuration and will deflect in a predetermined direction, cuttings which are: thrown on it when the machine tool is in operation.

A screw and nut assembly 20 intermediate the ends of the links II affords transverse compression of the links whereby the link members It may be simultaneously clamped in the desired position to the support I0 and to the bracket It can easily be seen from the drawing that the protecting shield I1 is adapted not only for swinging around the pin I9, but also for a similar motion around the pin l2. Such a mounting permits the shield to be swung back from the tool, i. e. towards the left in Fig. 1, to provide access to the tool, leaving only a very narrow gap between the shield I1 and the cover [8 when the parts are in their normal operative position. When the screw 9 is loosened, the whole support assembly of the shield H with the links II and support l0 may be rotated around the pivot 8, or may be moved to another part of the machine which need only be provided with a pivot as at 8.

While I have described and illustrated one embodiment of my invention, I do not wish to unnecessarily limit the scope of this invention, but reserve the right to make such modifications and rearrangements of the several parts as may come within the purview of the accompanying claims.

What I claim is:

1. A guard for a machine tool having a horizontal shaft and a bearing post therefor, said guard comprising a bracket member, a support member, ashield rigidly connected with said bracket member, link means vertically swingably connected with and straddling said support member and said bracket member, transverse compressing means intermediate the ends of said link means whereby the link means may be compressed to clamp said link means in the desired position relatively to said support member as well as to said bracket member, and a vertical pivot extending from the bearing post of the machine tool, said support member being horizontally rotatably and removably supported by said pivot.

2. A guard for a machine tool as defined in ANDRE BEdni'm.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Lamphere July 7, 1868 Knowlton Apr. 3, 1877 Fells Jan. 26, 1909 Muehlhauser Mar. 13, 1923 Whipple et al Dec. 24, 1929 Number 10 Number Name Date Jefireys July 4, 1939 Timmons Sept. 19, 1939 Johnson Nov. 5, 1946 'I'insler et al Dec. 24, 1946 Popp et a1. May 4, 1948 Toth et a1. May 10, 1949 FOREIGN PATENTS Country Date Great Britain May 4, 1922 Great Britain Aug. 8, 1945 

